不同CT值范围提示不同成分，下列叙述中错误的是（） A.3～18HU提示为液体 B.
题型：单项选择题
问题：
不同CT值范围提示不同成分，下列叙述中错误的是（）
A.3～18HU提示为液体
B.-1000HU提示为空气
C.-20～-80HU提示为脂肪
D.80～300HU提示为钙化
E.>400HU提示为骨骼
题型：单项选择题
Do you learn from your mistakes? I hope so. But have you ever made the same mistake twice? I have. Sometimes I make the same mistake three or four times!
Sometimes, good things happen because of mistakes. Once I got on the wrong train. That was a big mistake. But on that train, I saw a good friend. I was so happy I made that mistake!
Another time I ruined a surprise. My mother planned a surprise party for my father. She told me it was a secret. But I was just a little boy and I couldn’t keep the secret. I told my father about the party. At first, my mother was mad at me. But then my father said he was happy he knew about it. He said he didn’t like surprise.
When a good thing comes out of a mistake, that’s a happy accident.
小题1:The boy saw ___ on the wrong train.
A．his friend
B．his father
C．his mother
D．his teacher小题2: His mother asked him to ___.
A．plan a surprise party
B．tell his father about the party
C．keep a secret about the party
D．invite his friend to the party小题3: What does the boy think of mistakes?
A．Mistakes are not welcome.
B．A mistake is terrible thing..
C．All mistakes men happy accidents.
D．Sometimes a mistake can be a good thing.
